/***************************************************************************************************
  *Copyright(C),2010-2016,Sumscope
  *FileName	:  md5.cpp
  *Author	:  scofined.qi
  *Version	:  1.0
  *Date		:  2016/04/13
  *Desc		:  改自SSMD5.h,后续需要替换SSMD5.h的实现
  *Relation :
  *Others	:
  *Function :
  *History	:  1.极力减少头文件内容,尽可能移到CPP文件中,降低模块耦合度.by
  scofined.qi@sumscope.com,20160413
  2.增加MD5Impl类用于存储原先在文件作用域中的全局变量,
  避免多线程同时读写造成不稳定.by scofined.qi@sumscope.com,20160413
  ***************************************************************************************************/
#define _CRT_SECURE_NO_WARNINGS
#include "md5.h"

#include <string.h>

#include "../Utility.h"

#ifndef BASSERT
#define BASSERT  //
#endif
#ifndef BLOGERR
#define BLOGERR  //
#endif

namespace qb {
namespace base {

typedef unsigned int uint4;
typedef unsigned short int uint2;
typedef unsigned char uchar;

inline uint4 rotate_left(uint4 x, uint4 n) {
  return ((x << n) | (x >> (32 - n)));
}

inline uint4 F(uint4 x, uint4 y, uint4 z) { return ((x & y) | (~x & z)); }

inline uint4 G(uint4 x, uint4 y, uint4 z) { return ((x & z) | (y & ~z)); }

inline uint4 H(uint4 x, uint4 y, uint4 z) { return (x ^ y ^ z); }

inline uint4 I(uint4 x, uint4 y, uint4 z) { return (y ^ (x | ~z)); }

inline void FF(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s,
               uint4 ac) {
  a += F(b, c, d) + x + ac;
  a = rotate_left(a, s);
  a += b;
}

inline void GG(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s,
               uint4 ac) {
  a += G(b, c, d) + x + ac;
  a = rotate_left(a, s);
  a += b;
}

inline void HH(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s,
               uint4 ac) {
  a += H(b, c, d) + x + ac;
  a = rotate_left(a, s);
  a += b;
}

inline void II(uint4& a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s,
               uint4 ac) {
  a += I(b, c, d) + x + ac;
  a = rotate_left(a, s);
  a += b;
}

static unsigned char PADDING[64] = {
    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0,    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0,    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

class MD5Impl {
  uint4 m_State[4];
  uint4 m_Count[2];
  uchar m_Buffer[64];
  uchar m_Digest[16];
  uchar m_Finalized;

 public:
  MD5Impl() : m_Finalized(0) {
    memset(m_Digest, 0, 16 * sizeof(uchar));
    memset(m_Buffer, 0, 64 * sizeof(uchar));
    Init();
  }
  char* PrintMD5(uchar md5Digest[16]);
  char* MD5String(const char* szString);
  char* MD5String(const char* szString, int szStrLen);
  char* MD5File(const char* szFilename);

 protected:
  void Init();
  void Update(uchar* chInput, uint4 nInputLen);
  void Finalize();
  uchar* Digest();  // { return m_Digest; }

  void Transform(uchar* block);
  void Encode(uchar* dest, uint4* src, uint4 nLength);
  void Decode(uint4* dest, uchar* src, uint4 nLength);
};

char* MD5Impl::PrintMD5(uchar md5Digest[16]) {
  char chBuffer[256] = {0};
  char chEach[10] = {0};
  int nCount;

  memset(chBuffer, 0, 256);
  memset(chEach, 0, 10);

  for (nCount = 0; nCount < 16; nCount++) {
    FMTBUF(chEach, "%02x", md5Digest[nCount]);
    strncat(chBuffer, chEach, sizeof(chEach));
  }
#ifdef _MSC_VER
  return _strdup(chBuffer);
#else
  return strdup(chBuffer);
#endif
}

char* MD5Impl::MD5String(const char* szString) {
  Init();
  int nLen = strlen(szString);
  Update((unsigned char*)szString, (unsigned int)nLen);
  Finalize();

  return PrintMD5(Digest());
}
char* MD5Impl::MD5String(const char* szString, int szStrLen) {
  Init();
  Update((unsigned char*)szString, (unsigned int)szStrLen);
  Finalize();
  return PrintMD5(Digest());
}
char* MD5Impl::MD5File(const char* szFilename) {
  FILE* file;
  int nLen;
  unsigned char chBuffer[1024] = {0};

  try {
    memset(chBuffer, 0, 1024);

    if ((file = fopen(szFilename, "rb")) != NULL) {
      while (nLen = fread(chBuffer, 1, 1024, file)) Update(chBuffer, nLen);

      Finalize();

      fclose(file);

      return PrintMD5(Digest());
    }
  } catch (...) {
  }

  return NULL;  // failed
}

void MD5Impl::Init() {
  memset(m_Count, 0, 2 * sizeof(uint4));

  m_State[0] = 0x67452301;
  m_State[1] = 0xefcdab89;
  m_State[2] = 0x98badcfe;
  m_State[3] = 0x10325476;
}

void MD5Impl::Update(uchar* chInput, uint4 nInputLen) {
  uint4 i, index, partLen;

  // Compute number of bytes mod 64
  index = (unsigned int)((m_Count[0] >> 3) & 0x3F);

  // Update number of bits
  if ((m_Count[0] += (nInputLen << 3)) < (nInputLen << 3)) m_Count[1]++;

  m_Count[1] += (nInputLen >> 29);

  partLen = 64 - index;

  // Transform as many times as possible.
  if (nInputLen >= partLen) {
    memcpy(&m_Buffer[index], chInput, partLen);
    Transform(m_Buffer);

    for (i = partLen; i + 63 < nInputLen; i += 64) Transform(&chInput[i]);

    index = 0;
  } else
    i = 0;

  // Buffer remaining input
  memcpy(&m_Buffer[index], &chInput[i], nInputLen - i);
}

void MD5Impl::Finalize() {
  uchar bits[8] = {0};
  uint4 index, padLen;

  // Save number of bits
  Encode(bits, m_Count, 8);

  // Pad out to 56 mod 64
  index = (unsigned int)((m_Count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  Update(PADDING, padLen);

  // Append length (before padding)
  Update(bits, 8);

  // Store state in digest
  Encode(m_Digest, m_State, 16);

  memset(m_Count, 0, 2 * sizeof(uint4));
  memset(m_State, 0, 4 * sizeof(uint4));
  memset(m_Buffer, 0, 64 * sizeof(uchar));
}

uchar* MD5Impl::Digest() { return m_Digest; }

void MD5Impl::Transform(uchar* block) {
  uint4 a = m_State[0], b = m_State[1], c = m_State[2], d = m_State[3], x[16];

  Decode(x, block, 64);

  // Round 1
  FF(a, b, c, d, x[0], S11, 0xd76aa478);
  FF(d, a, b, c, x[1], S12, 0xe8c7b756);
  FF(c, d, a, b, x[2], S13, 0x242070db);
  FF(b, c, d, a, x[3], S14, 0xc1bdceee);
  FF(a, b, c, d, x[4], S11, 0xf57c0faf);
  FF(d, a, b, c, x[5], S12, 0x4787c62a);
  FF(c, d, a, b, x[6], S13, 0xa8304613);
  FF(b, c, d, a, x[7], S14, 0xfd469501);
  FF(a, b, c, d, x[8], S11, 0x698098d8);
  FF(d, a, b, c, x[9], S12, 0x8b44f7af);
  FF(c, d, a, b, x[10], S13, 0xffff5bb1);
  FF(b, c, d, a, x[11], S14, 0x895cd7be);
  FF(a, b, c, d, x[12], S11, 0x6b901122);
  FF(d, a, b, c, x[13], S12, 0xfd987193);
  FF(c, d, a, b, x[14], S13, 0xa679438e);
  FF(b, c, d, a, x[15], S14, 0x49b40821);

  // Round 2
  GG(a, b, c, d, x[1], S21, 0xf61e2562);
  GG(d, a, b, c, x[6], S22, 0xc040b340);
  GG(c, d, a, b, x[11], S23, 0x265e5a51);
  GG(b, c, d, a, x[0], S24, 0xe9b6c7aa);
  GG(a, b, c, d, x[5], S21, 0xd62f105d);
  GG(d, a, b, c, x[10], S22, 0x2441453);
  GG(c, d, a, b, x[15], S23, 0xd8a1e681);
  GG(b, c, d, a, x[4], S24, 0xe7d3fbc8);
  GG(a, b, c, d, x[9], S21, 0x21e1cde6);
  GG(d, a, b, c, x[14], S22, 0xc33707d6);
  GG(c, d, a, b, x[3], S23, 0xf4d50d87);
  GG(b, c, d, a, x[8], S24, 0x455a14ed);
  GG(a, b, c, d, x[13], S21, 0xa9e3e905);
  GG(d, a, b, c, x[2], S22, 0xfcefa3f8);
  GG(c, d, a, b, x[7], S23, 0x676f02d9);
  GG(b, c, d, a, x[12], S24, 0x8d2a4c8a);

  // Round 3
  HH(a, b, c, d, x[5], S31, 0xfffa3942);
  HH(d, a, b, c, x[8], S32, 0x8771f681);
  HH(c, d, a, b, x[11], S33, 0x6d9d6122);
  HH(b, c, d, a, x[14], S34, 0xfde5380c);
  HH(a, b, c, d, x[1], S31, 0xa4beea44);
  HH(d, a, b, c, x[4], S32, 0x4bdecfa9);
  HH(c, d, a, b, x[7], S33, 0xf6bb4b60);
  HH(b, c, d, a, x[10], S34, 0xbebfbc70);
  HH(a, b, c, d, x[13], S31, 0x289b7ec6);
  HH(d, a, b, c, x[0], S32, 0xeaa127fa);
  HH(c, d, a, b, x[3], S33, 0xd4ef3085);
  HH(b, c, d, a, x[6], S34, 0x4881d05);
  HH(a, b, c, d, x[9], S31, 0xd9d4d039);
  HH(d, a, b, c, x[12], S32, 0xe6db99e5);
  HH(c, d, a, b, x[15], S33, 0x1fa27cf8);
  HH(b, c, d, a, x[2], S34, 0xc4ac5665);

  // Round 4
  II(a, b, c, d, x[0], S41, 0xf4292244);
  II(d, a, b, c, x[7], S42, 0x432aff97);
  II(c, d, a, b, x[14], S43, 0xab9423a7);
  II(b, c, d, a, x[5], S44, 0xfc93a039);
  II(a, b, c, d, x[12], S41, 0x655b59c3);
  II(d, a, b, c, x[3], S42, 0x8f0ccc92);
  II(c, d, a, b, x[10], S43, 0xffeff47d);
  II(b, c, d, a, x[1], S44, 0x85845dd1);
  II(a, b, c, d, x[8], S41, 0x6fa87e4f);
  II(d, a, b, c, x[15], S42, 0xfe2ce6e0);
  II(c, d, a, b, x[6], S43, 0xa3014314);
  II(b, c, d, a, x[13], S44, 0x4e0811a1);
  II(a, b, c, d, x[4], S41, 0xf7537e82);
  II(d, a, b, c, x[11], S42, 0xbd3af235);
  II(c, d, a, b, x[2], S43, 0x2ad7d2bb);
  II(b, c, d, a, x[9], S44, 0xeb86d391);

  m_State[0] += a;
  m_State[1] += b;
  m_State[2] += c;
  m_State[3] += d;

  memset(x, 0, sizeof(x));
}

void MD5Impl::Encode(uchar* dest, uint4* src, uint4 nLength) {
  uint4 i, j;

  BASSERT(nLength % 4 == 0);

  for (i = 0, j = 0; j < nLength; i++, j += 4) {
    dest[j] = (uchar)(src[i] & 0xff);
    dest[j + 1] = (uchar)((src[i] >> 8) & 0xff);
    dest[j + 2] = (uchar)((src[i] >> 16) & 0xff);
    dest[j + 3] = (uchar)((src[i] >> 24) & 0xff);
  }
}

void MD5Impl::Decode(uint4* dest, uchar* src, uint4 nLength) {
  uint4 i, j;

  BASSERT(nLength % 4 == 0);

  for (i = 0, j = 0; j < nLength; i++, j += 4) {
    dest[i] = ((uint4)src[j]) | (((uint4)src[j + 1]) << 8) |
              (((uint4)src[j + 2]) << 16) | (((uint4)src[j + 3]) << 24);
  }
}

bool MD5::FromString(const char* szStr, int szStrLen, char* md5buf, int len) {
  if (szStr == 0 || md5buf == 0 || len <= 32 || szStrLen <= 0) {
    BLOGERR("[MD5]invalid argument");
    return false;
  }
  MD5Impl md5i;
  char* md5str = md5i.MD5String(szStr, szStrLen);
  bool succeed = false;
  if (md5str) {
    int md5len = strlen(md5str);
    if (md5len < len) {
      succeed = FIELDCOPYN(md5buf, len, md5str) == 32;
    }
    free(md5str);
  }
  return succeed;
}
bool MD5::FromString(const char* szStr, char* md5buf, int len) {
  if (szStr == 0 || md5buf == 0 || len <= 32) {
    BLOGERR("[MD5]invalid argument");
    return false;
  }
  MD5Impl md5i;
  char* md5str = md5i.MD5String(szStr);
  bool succeed = false;
  if (md5str) {
    int md5len = strlen(md5str);
    if (md5len < len) {
      succeed = FIELDCOPYN(md5buf, len, md5str) == 32;
    }
    free(md5str);
  }
  return succeed;
}
bool MD5::FromFile(const char* szFileName, char* md5buf, int len) {
  if (szFileName == 0 || md5buf == 0 || len <= 32) {
    BLOGERR("[MD5]invalid argument");
    return false;
  }
  MD5Impl md5i;
  char* md5str = md5i.MD5File(szFileName);
  bool succeed = false;
  if (md5str) {
    int md5len = strlen(md5str);
    if (md5len < len) {
      succeed = FIELDCOPYN(md5buf, len, md5str) == 32;
    }
    free(md5str);
  }
  return succeed;
}
}  // namespace base

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

uint4 m_State[4] = {0};
uint4 m_Count[2] = {0};
uchar m_Buffer[64] = {0};
uchar m_Digest[16] = {0};
uchar m_Finalized;

char* PrintMD5(uchar md5Digest[16]) {
  char chBuffer[256] = {0};
  char chEach[10] = {0};
  int nCount;

  memset(chBuffer, 0, 256);
  memset(chEach, 0, 10);

  int len = 0;
  for (nCount = 0; nCount < 16; nCount++) {
    sprintf(chEach, "%02x", md5Digest[nCount]);
    len = sizeof(chEach);
    strncat(chBuffer, chEach, len);
  }

#ifdef _MSC_VER
  return _strdup(chBuffer);
#else
  return strdup(chBuffer);
#endif
}

char* MD5String(const char* szString) {
  Init();
  int nLen = strlen(szString);
  Update((unsigned char*)szString, (unsigned int)nLen);
  Finalize();

  return PrintMD5(Digest());
}
char* MD5File(char* szFilename) {
  FILE* file;
  int nLen;
  unsigned char chBuffer[1024] = {0};

  // try
  {
    memset(chBuffer, 0, 1024);

    if ((file = fopen(szFilename, "rb")) != NULL) {
      while (1) {
        nLen = fread(chBuffer, 1, 1024, file);
        if (nLen <= 0) {
          break;
        }

        Update(chBuffer, nLen);
      }

      Finalize();

      fclose(file);

      return PrintMD5(Digest());
    }
  }
  // catch(...)
  {}

  return NULL;  // failed
}

void Init() {
  memset(m_Count, 0, 2 * sizeof(uint4));

  m_State[0] = 0x67452301;
  m_State[1] = 0xefcdab89;
  m_State[2] = 0x98badcfe;
  m_State[3] = 0x10325476;
}

void Update(uchar* chInput, uint4 nInputLen) {
  uint4 i, index, partLen;

  // Compute number of bytes mod 64
  index = (unsigned int)((m_Count[0] >> 3) & 0x3F);

  // Update number of bits
  if ((m_Count[0] += (nInputLen << 3)) < (nInputLen << 3)) m_Count[1]++;

  m_Count[1] += (nInputLen >> 29);

  partLen = 64 - index;

  // Transform as many times as possible.
  if (nInputLen >= partLen) {
    memcpy(&m_Buffer[index], chInput, partLen);
    Transform(m_Buffer);

    for (i = partLen; i + 63 < nInputLen; i += 64) Transform(&chInput[i]);

    index = 0;
  } else
    i = 0;

  // Buffer remaining input
  memcpy(&m_Buffer[index], &chInput[i], nInputLen - i);
}

void Finalize() {
  uchar bits[8] = {0};
  uint4 index, padLen;

  // Save number of bits
  Encode(bits, m_Count, 8);

  // Pad out to 56 mod 64
  index = (unsigned int)((m_Count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  Update(PADDING, padLen);

  // Append length (before padding)
  Update(bits, 8);

  // Store state in digest
  Encode(m_Digest, m_State, 16);

  memset(m_Count, 0, 2 * sizeof(uint4));
  memset(m_State, 0, 4 * sizeof(uint4));
  memset(m_Buffer, 0, 64 * sizeof(uchar));
}

uchar* Digest() { return m_Digest; }

void Transform(uchar* block) {
  uint4 a = m_State[0], b = m_State[1], c = m_State[2], d = m_State[3], x[16];

  Decode(x, block, 64);

  // Round 1
  FF(a, b, c, d, x[0], S11, 0xd76aa478);
  FF(d, a, b, c, x[1], S12, 0xe8c7b756);
  FF(c, d, a, b, x[2], S13, 0x242070db);
  FF(b, c, d, a, x[3], S14, 0xc1bdceee);
  FF(a, b, c, d, x[4], S11, 0xf57c0faf);
  FF(d, a, b, c, x[5], S12, 0x4787c62a);
  FF(c, d, a, b, x[6], S13, 0xa8304613);
  FF(b, c, d, a, x[7], S14, 0xfd469501);
  FF(a, b, c, d, x[8], S11, 0x698098d8);
  FF(d, a, b, c, x[9], S12, 0x8b44f7af);
  FF(c, d, a, b, x[10], S13, 0xffff5bb1);
  FF(b, c, d, a, x[11], S14, 0x895cd7be);
  FF(a, b, c, d, x[12], S11, 0x6b901122);
  FF(d, a, b, c, x[13], S12, 0xfd987193);
  FF(c, d, a, b, x[14], S13, 0xa679438e);
  FF(b, c, d, a, x[15], S14, 0x49b40821);

  // Round 2
  GG(a, b, c, d, x[1], S21, 0xf61e2562);
  GG(d, a, b, c, x[6], S22, 0xc040b340);
  GG(c, d, a, b, x[11], S23, 0x265e5a51);
  GG(b, c, d, a, x[0], S24, 0xe9b6c7aa);
  GG(a, b, c, d, x[5], S21, 0xd62f105d);
  GG(d, a, b, c, x[10], S22, 0x2441453);
  GG(c, d, a, b, x[15], S23, 0xd8a1e681);
  GG(b, c, d, a, x[4], S24, 0xe7d3fbc8);
  GG(a, b, c, d, x[9], S21, 0x21e1cde6);
  GG(d, a, b, c, x[14], S22, 0xc33707d6);
  GG(c, d, a, b, x[3], S23, 0xf4d50d87);
  GG(b, c, d, a, x[8], S24, 0x455a14ed);
  GG(a, b, c, d, x[13], S21, 0xa9e3e905);
  GG(d, a, b, c, x[2], S22, 0xfcefa3f8);
  GG(c, d, a, b, x[7], S23, 0x676f02d9);
  GG(b, c, d, a, x[12], S24, 0x8d2a4c8a);

  // Round 3
  HH(a, b, c, d, x[5], S31, 0xfffa3942);
  HH(d, a, b, c, x[8], S32, 0x8771f681);
  HH(c, d, a, b, x[11], S33, 0x6d9d6122);
  HH(b, c, d, a, x[14], S34, 0xfde5380c);
  HH(a, b, c, d, x[1], S31, 0xa4beea44);
  HH(d, a, b, c, x[4], S32, 0x4bdecfa9);
  HH(c, d, a, b, x[7], S33, 0xf6bb4b60);
  HH(b, c, d, a, x[10], S34, 0xbebfbc70);
  HH(a, b, c, d, x[13], S31, 0x289b7ec6);
  HH(d, a, b, c, x[0], S32, 0xeaa127fa);
  HH(c, d, a, b, x[3], S33, 0xd4ef3085);
  HH(b, c, d, a, x[6], S34, 0x4881d05);
  HH(a, b, c, d, x[9], S31, 0xd9d4d039);
  HH(d, a, b, c, x[12], S32, 0xe6db99e5);
  HH(c, d, a, b, x[15], S33, 0x1fa27cf8);
  HH(b, c, d, a, x[2], S34, 0xc4ac5665);

  // Round 4
  II(a, b, c, d, x[0], S41, 0xf4292244);
  II(d, a, b, c, x[7], S42, 0x432aff97);
  II(c, d, a, b, x[14], S43, 0xab9423a7);
  II(b, c, d, a, x[5], S44, 0xfc93a039);
  II(a, b, c, d, x[12], S41, 0x655b59c3);
  II(d, a, b, c, x[3], S42, 0x8f0ccc92);
  II(c, d, a, b, x[10], S43, 0xffeff47d);
  II(b, c, d, a, x[1], S44, 0x85845dd1);
  II(a, b, c, d, x[8], S41, 0x6fa87e4f);
  II(d, a, b, c, x[15], S42, 0xfe2ce6e0);
  II(c, d, a, b, x[6], S43, 0xa3014314);
  II(b, c, d, a, x[13], S44, 0x4e0811a1);
  II(a, b, c, d, x[4], S41, 0xf7537e82);
  II(d, a, b, c, x[11], S42, 0xbd3af235);
  II(c, d, a, b, x[2], S43, 0x2ad7d2bb);
  II(b, c, d, a, x[9], S44, 0xeb86d391);

  m_State[0] += a;
  m_State[1] += b;
  m_State[2] += c;
  m_State[3] += d;

  memset(x, 0, sizeof(x));
}

void Encode(uchar* dest, uint4* src, uint4 nLength) {
  uint4 i, j;

  assert(nLength % 4 == 0);

  for (i = 0, j = 0; j < nLength; i++, j += 4) {
    dest[j] = (uchar)(src[i] & 0xff);
    dest[j + 1] = (uchar)((src[i] >> 8) & 0xff);
    dest[j + 2] = (uchar)((src[i] >> 16) & 0xff);
    dest[j + 3] = (uchar)((src[i] >> 24) & 0xff);
  }
}

void Decode(uint4* dest, uchar* src, uint4 nLength) {
  uint4 i, j;

  assert(nLength % 4 == 0);

  for (i = 0, j = 0; j < nLength; i++, j += 4) {
    dest[i] = ((uint4)src[j]) | (((uint4)src[j + 1]) << 8) |
              (((uint4)src[j + 2]) << 16) | (((uint4)src[j + 3]) << 24);
  }
}
}  // namespace qb
